Solar System Size for Your Home

Find the Right Solar System Size for Your Home in 1 Minute – Quick Solar Capacity Calculator (2025)

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Find the Right Solar System Size for Your Home in 1 Minute: Thinking about going solar but confused about how many kW (kilowatts) your home actually needs? Don’t worry this 1-minute solar capacity guide will help you find the perfect system size based on your electricity usage, budget, and rooftop space.

Let’s get started.

Step 1: Check Your Monthly Electricity Bill

First, look at your electricity bill and note the average units (kWh) you consume per month.

Monthly Units UsedRecommended Solar System
100 – 150 units1.5kW – 2kW system
150 – 250 units2.5kW – 3kW system
250 – 400 units4kW – 5kW system
400+ units6kW – 8kW system

Quick Formula:
System Size (kW) = Monthly Units ÷ 120

Example: 240 units/month → 240 ÷ 120 = 2kW system

Step 2: Consider Your Rooftop Space

Each 1kW solar system needs 80–100 sq. ft. of shadow-free rooftop space.

System SizeSpace Required
2kW180–200 sq. ft.
3kW250–300 sq. ft.
5kW400–500 sq. ft.

Make sure your roof gets 5–6 hours of direct sunlight every day.

Step 3: Choose Based on Your Goals

GoalSuggested System
Reduce electricity bill2kW – 3kW
Zero electricity bill5kW – 6kW
Off-grid power + backup3kW+ Hybrid system

Step 4: Apply for Subsidy

Under PM Surya Ghar Yojana, you get up to ₹78,000 subsidy on solar systems up to 10kW.

Apply here: https://pmsuryaghar.gov.in

Final Word

Choosing the right solar system size is simple. Just check your monthly power use, measure your rooftop space, and match it to the ideal kW capacity. A well-sized system will not only cut your electricity bills but also give you peace of mind for 25+ years.

So go solar smart your roof is your future power plant.

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